I was waiting for someone to mention that song. It's one of my favorite Christmas songs. Others I enjoy:
"Hark! The Herald Angels Sing"
"O Come all Ye Faithful"
"Have Yourself a Merry Little Christmas" by Leann Rimes
"I Pray on Christmas" by Harry Connick, Jr.
"Silent Night" by Sinead O'Connor
I'm not familiar with those last three, but I'll keep an ear out for them=)
Another song I crank up anytime it comes on is Elvis doing 'Blue Christmas'.